"rootbound" in the adjective sense
1. potbound, rootbound
of a potted plant) grown too large for its container resulting in matting or tangling of the roots
2. rootbound
having the roots matted or densely tangled
"shaggy untended lawns of old trees and rootbound scented flowers and shrubs"- William Faulkner
Source: WordNet® (An amazing lexical database of English)
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